To Create a Node Agent Placeholder

A node agent is a local watchdog for server instances that are
running on a remote machine. Therefore, a node agent must be created on the
machine that is hosting the server instances. As a result of this requirement,
you can use the Admin Console to create only a placeholder for a node agent.
This placeholder is a node agent configuration for which a node agent does
not yet exist.

After creating a placeholder, use the asadmin command
create-node-agent on the machine hosting the node agent
to complete the creation. For more information, see Creating a Node Agent.